Electron Correlation and Bond Properties in Some Selected Sulfur Compounds

Bent, Henry A.

doi:10.1016/b978-0-08-011062-2.50005-x

Cited by 3 publications

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“…A second pathway for the development of the Kimball free-cloud model came about in 1963 when Henry Bent (Figure ), then at the University of Minnesota, published the first installment of a six-part series on the model in the Journal of Chemical Education . − Over the next two decades Bent would also publish several additional popular articles on this subject, − as well as applying the model in several advanced review articles dealing with a variety of other subjects. − More recently, Schultz has published a summary of various pedagogical applications of the model and Bent has published a two-volume, book-length monograph dealing with these models…”

Section: The Tangent-sphere Approachmentioning

confidence: 99%

The Kimball Free-Cloud Model: A Failed Innovation in Chemical Education?

Jensen

2014

J. Chem. Educ.

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This historical review traces the origins of the Kimball free-cloud model of the chemical bond, otherwise known as the charge-cloud or tangent-sphere model, and the central role it played in attempts to reform the introductory chemical curriculum at both the high school and college levels in the 1960s. It also critically evaluates the limitations of the model, its current implicit role in the teaching of VSEPR theory, and its pedagogical implications, as well as providing a resource paper for those chemical educators interested in exploring its present-day applications.

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Section: The Tangent-sphere Approachmentioning

confidence: 99%

The Kimball Free-Cloud Model: A Failed Innovation in Chemical Education?

Jensen

2014

J. Chem. Educ.

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Methoden und Möglichkeiten der nucleophilen Acylierung

Seebàch¹

1969

Angewandte Chemie

137

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Methods and Possibilities of Nucleophilic Acylation

Seebàch¹

1969

Angew. Chem. Int. Ed. Engl.

263

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The detection of tricycloalkanes appears to be more definite with FI than with EB, since no data were reported in the latter case. The same is true of the indans and tetralins, whose presence in the sample was reported by some of the laboratories using EB mass spectrometers and not by others. The molecular weight distribution for the groups is given directly by the FI mass spectra. To summarize, therefore, the analysis of high-boiling hydrocarbon mixtures containing many components by means of an FI mass spectrometer is much simpler if the sensitivity coefficients of the groups of substances are constant. Long calculations are avoided in the evaluation of the spectra, and it is unnecessary to solve extremely large matrix systems or to make allowance for the masking of fragments of heavier components by the lighter components. The detection of trace components in a mixture is more definite with FI than with EB; this observation is not confined to the highboiling hydrocarbon mixtures discussed here.Finally, it should be mentioned that Wanless 163,641 has constructed "FI metastable maps", which simplify[63] G. G. Wanless and G. A . Glock jr., Analytic. Chem. 39, 2 (1967). Nucleophilic acylation is the attachment of an R-C=O group to an electrophilic center. A brief discussion of the advantages offered by acylations of this type in syntheses is followed by a description of the direct methods (reactions with acylmetal compounds) and the methods proceeding via "masked" acyl anions. The latter methods are based on the use of either metalated vinyl ether derivatives or carbanions derived from acetals. Organyllithiums of sulfur-stabilized carbanions are important reagents of this type.The synthetic methods of organic chemistry have always been greatly enriched by the direct or indirect "reversal" of the mode of reaction of a reagent. Thus when water is added to unsymmetrically substituted double bonds, the OH group in the product is always attached to the carbon atom carrying the greater number of alkyl substituents (Murkownikof's rule). 111 A separate review of the dithiane method of nucleophilic acylation has already been published [84].tion would require HO @ as an electrophile, the intermediate resulting from the primary attack by this species then being "neutralized" by an He. This is not C H, c H3 7 H3 I H Scheme 1. R,B-CH2-C-CH, Angew. Chem. internat. Edit. f Vol. 8 (1969) J No. 9 [5] J . and other literature cited therein; b) E. J. Corey and L. S. Hegedus, J. Amer. chem. SOC., in press; c) 91, 1233 (1969). 181 a) Cf. Reaction of phenyllithium with hexacarbonyltungsen to give lithium benzoylpentacarbonyltungstate(O), E. 0. Fischer and A . MaasboI, Angew. Chem. 76, 645 (1964); Angew. Chem. internat. Edit. 3, 580 (1964); Chem. Ber. 100, 2445 (1967); b) M . Schlosser, Angew. Chem. 76, 124 (1964); Angew. Chem. internat. Edit. 3,287 (1964) and literature cited therein; c) cf. also, Hg-derivatives: D. Seyferth and R. J . Spohn, J. Amer. chem. SOC. 91, 3037 (1969).

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Electron Correlation and Bond Properties in Some Selected Sulfur Compounds

Cited by 3 publications

References 106 publications

The Kimball Free-Cloud Model: A Failed Innovation in Chemical Education?

The Kimball Free-Cloud Model: A Failed Innovation in Chemical Education?

Methoden und Möglichkeiten der nucleophilen Acylierung

Methods and Possibilities of Nucleophilic Acylation

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